from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A colorless crystalline amino acid, C4H9NO3, that is obtained from the hydrolysis of protein and is an essential component of human nutrition.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An essential amino acid C4H19NO3 found in most animal proteins.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a colorless crystalline amino acid found in protein; occurs in the hydrolysates of certain proteins; an essential component of human nutrition
Probably from threose, a kind of sugar (alteration of erythrose : erythro- + -ose2) + -ine2.(American Heritage® Dictionary of the English Language, Fourth Edition)